First of all, I believe you are supposed to affect the src
property of iframes, not location
. Second of all, hook the iframe’s load
event to perform your changes:
var myIframe = document.getElementById('righttop');
myIframe.addEventListener("load", function() {
this.contentWindow.document.notesform.ID_client.value = Client;
});
myIframe.src="https://stackoverflow.com/questions/1463581/timesheet_notes.php";
Again, this is all presuming you mean iframe, not framesets.